Drilling Technology

Gyro Multishot Surveys

The gyroscopic multishot is the survey tool for surveying extended intervals inside casing or drill pipe without a non-magnetic drill collar. The tool comes in two sizes. The smaller one can be run in completed wells or through drill pipe. The larger one is a more rugged tool and is used to run surveys inside casing. Depending on the length of survey run, it will be a number of hours before the calculated survey data are available.

Gyro multishot drifts are the same as that of the single shot gyro. Surface Read-out Gyroscopes

Surface read-out gyroscopes are used for the same purposes in single shot and multishot data collection. The instrumentation is more sophisticated and requires a conducting wireline to power the tool and transmit the information back to the surface for decoding by computer. With a surface read-out multishot gyro, the drift can be constantly monitored to ensure the tool is performing well and the calculated survey is produced shortly after completing the log run.

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